DTC Code | DTC Name |
---|---|
P0641 | Sensor Reference Voltage "A" Circuit / Open |
DESCRIPTION
When the sensor power source voltage is too low, the engine stop and start ECU stores DTC P0641 and blinks the stop and start cancel indicator light.
DTC No. | DTC Detection Condition | Trouble Area |
---|---|---|
P0641 | The following condition continues for 0.5 seconds or more (1 trip detection logic):
|
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CONFIRMATION DRIVING PATTERN
Tech Tips
DTCs for the stop and start system are not cleared even if the malfunction has been repaired. After repairing the malfunction, be sure to clear the DTCs Click here.
CONFIRMATION AFTER TROUBLESHOOTING
Tech Tips
If the cable is disconnected from the negative (-) battery terminal, stop and start control is prohibited until refresh charge is completed. In this case, drive the vehicle approximately 5 to 40 minutes until refresh charge is completed and stop and start control operation is permitted.
Allow the engine to idle for 3 minutes after the engine warms up and check that the engine speed is within 50 rpm of the target idle speed.
Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Clear the DTCs Click here.
Start the engine and warm it up.
Drive the vehicle at 7 km/h (4.3 mph) or more.
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
Stop the vehicle, move the shift lever to neutral and release the clutch pedal.
Keep the engine stopped by stop and start control for 1 second or more.
Depress the clutch pedal and start the engine.
Tech Tips
If the engine cranks slowly when the engine is restarted, it can be determined that battery voltage is low.
Check that DTCs are not output Click here.
STOP AND START SYSTEM OPERATION CHECK
Tech Tips
If the cable is disconnected from the negative (-) battery terminal, stop and start control is prohibited until refresh charge is completed. In this case, drive the vehicle approximately 5 to 40 minutes until refresh charge is completed and stop and start control operation is permitted.
Start the engine and warm it up.
Turn the air conditioning system off.
Drive the vehicle at 7 km/h (4.3 mph) or more.
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
Stop the vehicle, move the shift lever to neutral and release the clutch pedal.
Allow the engine to stop by stop and start control.
Depress the clutch pedal and start the engine.
WIRING DIAGRAM
Refer to DTC P060A Click here.
CAUTION / NOTICE / HINT
Note
Before replacing the engine stop and start ECU, read the number of starter operations and write it into a new engine stop and start ECU Click here.
After replacing the engine stop and start ECU or air conditioning amplifier assembly, reset and perform learning of the air conditioning information in the engine stop and start ECU Click here.
After replacing the engine stop and start ECU or yaw rate sensor, perform deceleration sensor zero point clear and calibration Click here.
Inspect the fuses for circuits related to this system before performing the following procedure.
Tech Tips
Using the GTS, read the freeze frame data before troubleshooting. System condition information is recorded as freeze frame data the moment a DTC is stored. This information can be useful when troubleshooting Click here.
PROCEDURE
CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - BATTERY)
*a | Front view of wire harness connector (to Engine Stop and Start ECU) |
Disconnect the engine stop and start ECU connector.
Measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||
---|---|---|---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - BODY GROUND)
Disconnect the A79 engine stop and start ECU connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
OK |
REPLACE ENGINE STOP AND START ECU Click here |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |